| from langchain_core.output_parsers import StrOutputParser | |
| from langchain_core.prompts import ChatPromptTemplate | |
| from langchain_core.runnables import RunnablePassthrough | |
| from langchain_openai import ChatOpenAI | |
| prompt = ChatPromptTemplate.from_template("Tell me a short joke about {topic}") | |
| output_parser = StrOutputParser() | |
| model = ChatOpenAI(model="gpt-3.5-turbo") | |
| chain = {"topic": RunnablePassthrough()} | prompt | model | output_parser | |
| if __name__ == "__main__": | |
| print(chain.invoke("ice cream")) |